SWI-Prolog -- API-function Sseterr

Documentation
- Reference manual
  - Foreign Language Interface
    - Foreign access to Prolog IO streams
      - Foreign stream error handling
        
        Sferror()
        
        Sclearerr()
        
        Sseterr()
        
        Sset_exception()
- Packages

Availability:C-language interface function

int Sseterr(IOSTREAM *s, int which, const char *message)

Set an error or warning state on the stream. The which argument is one of SIO_WARN or SIO_FERR. This causes PL_release_stream() to print a message (SIO_WARN) or raise an exception (SIO_FERR).